Absorbent Core Channels for Leakage Control
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Solution Overview
Problem
Absorbent articles for personal hygiene, such as diapers and sanitary napkins, face challenges with leakage due to the expansion of absorbent cores containing superabsorbent polymers, which can cause barrier leg cuffs to lose contact with the skin, leading to reduced functionality and increased leakage risk.
Innovation Solution
The absorbent article features a core wrap comprising at least 80% superabsorbent polymers with a channel configuration oriented in the longitudinal direction, providing improved containment and distribution of fluids through a C-wrap design with nonwoven materials and a fibrous thermoplastic adhesive, maintaining integrity and preventing leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high amount of superabsorbent material is used in the absorbent core, then absorbent capacity is improved, but the core expands and causes barrier leg cuffs to lose contact with skin leading to leakage
Solution Approach 1:
The absorbent core is segmented into multiple functional zones: a first zone with high SAP content (at least 80% by weight) for maximum absorption, and a second zone with reduced SAP content to control expansion. This segmentation allows the core to achieve high absorbent capacity while maintaining structural integrity and preventing barrier leg cuffs from losing contact with the skin.
Solution Approach 2:
Different regions of the absorbent core are assigned different material compositions tailored to their specific functions. The first zone uses high SAP content for rapid absorption of large quantities of exudates, while the second zone uses reduced SAP content to minimize expansion and maintain core stability, ensuring barrier leg cuffs remain in contact with the skin.
2Quantity of substance
If absorbent core expands to increase absorbency, then liquid absorption is improved, but structural integrity deteriorates causing sagging and leakage
Solution Approach 1:
The absorbent core is divided into a first zone with high SAP content for maximum liquid absorption and a second zone with reduced SAP content to provide structural support. This segmentation enables the core to absorb large quantities of liquid while the second zone prevents excessive expansion and maintains structural integrity, avoiding sagging and leakage.
Solution Approach 2:
The absorbent core uses a composite structure combining different SAP concentrations in adjacent zones. The first zone contains at least 80% SAP by weight for high absorption, while the second zone has reduced SAP content to provide mechanical stability. This composite material approach allows the core to simultaneously achieve high liquid absorption and maintain structural integrity during use.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances the absorbent article's ability to maintain contact with the skin and prevent leakage by ensuring the absorbent core's structural integrity and efficient fluid distribution, thereby improving the overall performance and wearer comfort.
Implementation Method 1
The function of the absorbent core is to absorb and retain the exudates for a prolonged amount of time
Implementation Method 2
a blend of comminuted wood pulp with superabsorbent polymers (SAP) in particulate form, also called absorbent gelling materials (AGM)
Implementation Method 3
The first nonwoven and the second nonwoven are bonded to each other through a portion of the channel
Data Source
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AI summary
The present disclosure is directed, in part, to an absorbent article that comprises an absorbent core disposed at least partially intermediate a topsheet and a backsheet and a core wrap enclosing an absorbent material. The core wrap comprises a first material and a second material. The first material forms a C-wrap at least partially around the second material. The absorbent material comprises at least 80% of superabsorbent polymers by weight of the absorbent material. The absorbent core comprises a channel substantially free of the superabsorbent polymers, at least partially oriented in a longitudinal direction of the article, and comprising an arcuate portion. The channel has lateral widths taken parallel to a lateral axis of the article. The profile of the lateral widths of the channel over a longitudinal length of at least 50mm of the channel taken along the longitudinal axis is substantially constant.